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ADS1178读的数据全部为0

Other Parts Discussed in Thread: ADS1178

关于ADS1178:

当前我们使用SPI数据模式.CLK的频率为250K.通道为全部有效,高电平状态.发送SYNC信号后,接收到DRDY信号下降沿,读取不到数据,全部为低电平.电路图如下所示.

请问是什么原因造成的?